<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Task 018</title>
    <link rel="stylesheet" href="style.css" />
</head>
<body>
<section>
    <div class="operation-wrapper">
        <input id="queue-value" type="text" value="22" />
        <button>左侧入</button>
        <button>右侧入</button>
        <button>左侧出</button>
        <button>右侧出</button>
    </div>
    <div id="queue-wrapper">

    </div>
</section>
<script src="task.js"></script>
</body>
</html>